﻿// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.CompilerServices;

namespace ICSharpCode.SharpDevelop.Widgets
{
	/// <summary>
	/// Base class for view models; implements INotifyPropertyChanged.
	/// </summary>
	public class ViewModelBase : INotifyPropertyChanged
	{
		public event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;

		protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
		{
			var handler = this.PropertyChanged;
			if (handler != null) {
				handler(this, new PropertyChangedEventArgs(propertyName));
			}
		}
		
		protected void SetAndNotifyPropertyChanged<T>(ref T field, T newValue, [CallerMemberName] string propertyName = null)
		{
			if (!EqualityComparer<T>.Default.Equals(field, newValue)) {
				field = newValue;
				OnPropertyChanged(propertyName);
			}
		}
	}
}
